The four subunits that make up DNA are called
A) phosphodiesters.
B) proteins.
C) nucleotides.
D) nucleosides.
E) polymers.
C) nucleotides.
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In a normal Drosophila embryo, a gap gene called Krüppel is expressed in the anterior end because it is activated by Hunchback protein, and this region contains a high level of Hunchback
A. true B. false
T cell receptors can discriminate between self (MHC markers) and nonself (____)
Fill in the blank(s) with correct word
Reptiles show numerous adaptations for a completely terrestrial life cycle. One adaptation that first occurred in the reptiles includes:
a. tetraploidy. b. endothermy. c. the ability to "breathe" through their skin. d. lungs. e. the amniotic egg.
Which of the following occurs in the first stage of glycolysis?
a. Preparing the six-carbon ring of glucose for separation b. Dividing the six-carbon ring of glucose into two three-carbon rings c. Extracting ATP and high-energy electrons from hydrogen atoms d. Producing NADH and ATP to prepare for glucose separation